/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.druid.server.scheduling;

import org.apache.druid.client.SegmentServerSelector;
import org.apache.druid.query.QueryPlus;
import org.apache.druid.server.QueryPrioritizationStrategy;

import java.util.Optional;
import java.util.Set;

/**
 * Does nothing, the user must set the {@link org.apache.druid.query.QueryContexts#PRIORITY_KEY} on the query context
 * to get a priority.
 */
public class ManualQueryPrioritizationStrategy implements QueryPrioritizationStrategy
{
  public static final QueryPrioritizationStrategy INSTANCE = new ManualQueryPrioritizationStrategy();

  @Override
  public <T> Optional<Integer> computePriority(QueryPlus<T> query, Set<SegmentServerSelector> segments)
  {
    return Optional.empty();
  }
}
